Phone-based lead generation required for UK SMS business

We require a top person to call existing leads (cold to luke warm) and turn them into hot leads, ready for follow-up by business director.
Our service is offering bulk SMS communications and marketing to businesses, primarily in the UK.
This is not full-time so need someone who has a couple of hours per day during UK business hours - can be flexible with which hours. Initially a few weeks but take it from there, could be ongoing.
Must have good experience of phone-based lead gen for B2B, and have a good professional phone manner and be a good clear communicator.
Through initial and ongoing support from our business director, must be able to show understanding of what we do and be a quick learner.